package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对0
        // TODO 后期需要进行md5加密，然后再进行比对
        // 对前端传来的明文密码进行MD5加密
        password = DigestUtils.md5DigestAsHex(password.getBytes()); //MD5加密
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }
    /**
     * 新增员工
     * @param employeeDTO
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();

        //将DTO数据拷贝到Employee中
        BeanUtils.copyProperties(employeeDTO,employee);

        //插入状态码 1正常 0锁定
        employee.setStatus(StatusConstant.ENABLE);

        //插入密码并进行MD5加密
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //插入创建时间和修改时间，默认是系统当前时间
        /*employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());*/

        //插入创建人id和修改人id
        //TODO 后期需要把id修改成动态获取，保存当前登录人的id。我猜测是通过令牌token的解密去传递这个id。
        /*employee.setCreateUser(BaseContext.getCurrentId());
        employee.setUpdateUser(BaseContext.getCurrentId());*/

        employeeMapper.insert(employee);
    }

    /**
     * 员工分页查询
     *
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        //开始分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());
        Page<Employee> page= employeeMapper.pageQuery(employeePageQueryDTO);
        long total = page.getTotal();
        List<Employee> records = page.getResult();
        PageResult pageResult = new PageResult();
        pageResult.setTotal(total);
        pageResult.setRecords(records);
        return pageResult;
    }
    /**
     * 启用禁用员工账号
     * @param status
     * @param id
     * @return
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //方法1直接引用
        //employeeMapper.update(status,id);

        /*Employee employee = new Employee();
        employee.setStatus(status);
        employee.setId(id);*/

        //方法2通过对象实体获取属性
        Employee employee = Employee.builder()
                        .id(id)
                        .status(status)
                        .build();
        employeeMapper.update(employee);
    }
    /**
     * 根据id查询员工信息
     *
     * @param id
     * @return
     */
    @Override
    public Employee getById(Long id) {
        Employee employee = employeeMapper.getById(id);
        //注意！这里需要将密码设置成不可见，否则容易数据泄露
        employee.setPassword("******");
        return employee;
    }

    /**
     * 修改员工信息
     *
     * @param employeeDTO
     * @return
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        //陷阱！：虽然前端传回一个DTO对象，可以直接使用DTO对象进行修改员工信息
        //但实际数据库修改的是Employee对象的所有数据，真正需要是Employee对象中的数据
        Employee employee = new Employee();
        //数据拷贝 employeeDTO -> employee
        BeanUtils.copyProperties(employeeDTO,employee);
        //设置修改时间
        //employee.setUpdateTime(LocalDateTime.now());
        //设置修改人id
        //employee.setUpdateUser(BaseContext.getCurrentId());
        // 调用 Mapper 更新数据库中的员工信息
        employeeMapper.update(employee);
    }
}
